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| /*************************************************************************** | ||
| * _ _ ____ _ | ||
| * Project ___| | | | _ \| | | ||
| * / __| | | | |_) | | | ||
| * | (__| |_| | _ <| |___ | ||
| * \___|\___/|_| \_\_____| | ||
| * | ||
| * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al. | ||
| * | ||
| * This software is licensed as described in the file COPYING, which | ||
| * you should have received as part of this distribution. The terms | ||
| * are also available at http://curl.haxx.se/docs/copyright.html. | ||
| * | ||
| * You may opt to use, copy, modify, merge, publish, distribute and/or sell | ||
| * copies of the Software, and permit persons to whom the Software is | ||
| * furnished to do so, under the terms of the COPYING file. | ||
| * | ||
| * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | ||
| * KIND, either express or implied. | ||
| * | ||
| ***************************************************************************/ | ||
|
|
||
| #include <iostream> | ||
| #include <stdio.h> | ||
| #include <string.h> | ||
| #include <stdlib.h> | ||
| #include <sys/time.h> | ||
| #include <time.h> | ||
| #include <unistd.h> | ||
| #include <sys/poll.h> | ||
| #include <curl/curl.h> | ||
| #include <event.h> | ||
| #include <fcntl.h> | ||
| #include <sys/stat.h> | ||
| #include <errno.h> | ||
| #include <functional> | ||
|
|
||
| using std::function; | ||
| using namespace std; | ||
| event_base* eb; | ||
| CURLM *m; | ||
| event timer_event; | ||
| struct taskInfo | ||
| { | ||
| int socket; | ||
| int act; //from libcurl | ||
| CURL* c; | ||
| event ev; //libevent struct is embedded within | ||
| bool isAdded; //whether this is registered with libevent | ||
| }; | ||
| struct curlTaskInfo | ||
| { | ||
| CURL *c; | ||
| function<void(CURL*, CURLcode)> cb; | ||
| //void* userdata; | ||
| }; | ||
| void cb_event(int fd, short events, void *userp); | ||
| void setTaskInfo(taskInfo* t, int s, CURL* c, int act) | ||
| { //has the side effect of registering or re-registering the event with libevent | ||
| int events = | ||
| (act&CURL_POLL_IN?EV_READ:0)|(act&CURL_POLL_OUT?EV_WRITE:0)|EV_PERSIST; | ||
| if(t->isAdded) | ||
| event_del(&t->ev); | ||
| t->socket=s; | ||
| t->act=act; | ||
| t->c=c; | ||
| t->isAdded=true; | ||
| event_assign(&t->ev,eb,s,events,cb_event,t); | ||
| event_add(&t->ev, NULL); | ||
| } | ||
| void checkQueue() | ||
| { | ||
| CURLMsg *msg; | ||
| int msgs_left; | ||
| while ((msg = curl_multi_info_read(m, &msgs_left))) { | ||
| if (msg->msg == CURLMSG_DONE) { | ||
| CURL *c=msg->easy_handle; | ||
| curlTaskInfo* t=NULL; | ||
| curl_easy_getinfo(c, CURLINFO_PRIVATE, &t); | ||
| //cout << "t = " << t << endl; | ||
| t->cb(c,msg->data.result); | ||
| curl_multi_remove_handle(m, c); | ||
| curl_easy_cleanup(c); | ||
| delete t; | ||
| } | ||
| } | ||
| } | ||
| void cb_event(int fd, short events, void *userp) | ||
| { // an event has been received from libevent | ||
| int act = | ||
| (events & EV_READ ? CURL_CSELECT_IN : 0) | | ||
| (events & EV_WRITE ? CURL_CSELECT_OUT : 0); | ||
| int num_transfers; | ||
| curl_multi_socket_action(m, fd, act, &num_transfers); | ||
| checkQueue(); | ||
| } | ||
|
|
||
| /* CURLMOPT_SOCKETFUNCTION */ | ||
| int cb_sock(CURL *c, curl_socket_t s, int what, void *cbp, void *sockp) | ||
| { | ||
| //cout << "cb_sock()" << endl; | ||
| taskInfo* t=(taskInfo*)sockp; | ||
| if(what==CURL_POLL_REMOVE && t!=NULL) { | ||
| if(t->isAdded) | ||
| event_del(&t->ev); | ||
| delete t; | ||
| } else { | ||
| if(t==NULL) { //add | ||
| t=new taskInfo(); | ||
| t->isAdded=false; | ||
| setTaskInfo(t,s,c,what); | ||
| curl_multi_assign(m,s,t); | ||
| } else { //modify events monitored | ||
| setTaskInfo(t,s,c,what); | ||
| } | ||
| } | ||
| return 0; | ||
| } | ||
| void addCurlTask(CURL* c, const function<void(CURL*,CURLcode)>& cb) | ||
| { | ||
| curlTaskInfo* t=new curlTaskInfo(); | ||
| t->c=c; | ||
| t->cb=cb; | ||
| //t->userdata=userdata; | ||
| curl_easy_setopt(c, CURLOPT_PRIVATE, t); | ||
| curl_multi_add_handle(m, c); | ||
| } | ||
| struct transferInfo | ||
| { | ||
| function<bool(const void* data, int len, int state)> cb; | ||
|
|
||
| }; | ||
| size_t cb_data(void *data, size_t size, size_t nmemb, void *userdata) | ||
| { | ||
| transferInfo* t=(transferInfo*)userdata; | ||
| t->cb(data,size*nmemb,3); | ||
| return size; | ||
| } | ||
| void addTransfer(const char* url, | ||
| const function<bool(const void* data, int len, int state)>& cb) | ||
| /*-1:failed 1:connected 2:sent 3:recving 4:closed*/ | ||
| { | ||
| CURL* c=curl_easy_init(); | ||
| curl_easy_setopt(c, CURLOPT_URL, url); | ||
| transferInfo* t=new transferInfo(); | ||
| t->cb=cb; | ||
| curl_easy_setopt(c, CURLOPT_WRITEDATA, t); | ||
| curl_easy_setopt(c, CURLOPT_WRITEFUNCTION, cb_data); | ||
| addCurlTask(c,[t](CURL* c,CURLcode res) | ||
| { | ||
| t->cb(NULL,0,4); | ||
| delete t; | ||
| }); | ||
| } | ||
| int cb_curl_timer(CURLM *m, long timeout_ms, void* userdata) | ||
| { /* Update the event timer after curl_multi library calls */ | ||
| struct timeval timeout; | ||
|
|
||
| timeout.tv_sec = timeout_ms/1000; | ||
| timeout.tv_usec = (timeout_ms%1000)*1000; | ||
| //printf("multi_timer_cb: Setting timeout to %ld ms\n", timeout_ms); | ||
| evtimer_add(&timer_event, &timeout); | ||
| return 0; | ||
| } | ||
| void cb_timer(int fd, short kind, void *userp) | ||
| { | ||
| int num_transfers; | ||
| curl_multi_socket_action(m, | ||
| CURL_SOCKET_TIMEOUT, 0, &num_transfers); | ||
| checkQueue(); | ||
| } | ||
| int main(int argc, char **argv) | ||
| { | ||
| eb=event_base_new(); | ||
| m=curl_multi_init(); | ||
|
|
||
| event_assign(&timer_event,eb,-1,0,cb_timer,NULL); | ||
| curl_multi_setopt(m, CURLMOPT_SOCKETFUNCTION, cb_sock); | ||
| curl_multi_setopt(m, CURLMOPT_TIMERFUNCTION, cb_curl_timer); | ||
|
|
||
| addTransfer("https://graph.facebook.com/4",[](const void* data, int len, int state) | ||
| { | ||
| //cout << len << endl; | ||
| if(data!=NULL && len>0) | ||
| write(1,data,len); | ||
| return true; | ||
| }); | ||
| //sleep(5); | ||
| event_base_dispatch(eb); | ||
| curl_multi_cleanup(m); | ||
| return 0; | ||
| } |
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